This is what I thought as well. There might be issues with angular momentum and inertia, and problems with windows (gravity would be perpendicular to the axis

This is what I thought as well. There might be issues with angular momentum and inertia, and problems with windows (gravity would be perpendicular to the axis of rotation) but they could finesse this by having the living/exercise/sleeping quarters artificially lit and the control environment with those velcro sox padding about on carpet.